linux-kernel - Re: [PATCH] hotplug: Optimize {get,put}_online

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Date:	Mon, 23 Sep 2013 18:02:54 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] hotplug: Optimize {get,put}_online_cpus()

On Mon, Sep 23, 2013 at 11:59:08AM -0400, Steven Rostedt wrote:
> On Mon, 23 Sep 2013 17:22:23 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > Still no point in using srcu for this; preempt_disable +
> > synchronize_sched() is similar and much faster -- its the rcu_sched
> > equivalent of what you propose.
> 
> To be honest, I sent this out last week and it somehow got trashed by
> my laptop and connecting to my smtp server. Where the last version of
> your patch still had the memory barrier ;-)

Ah, ok, yes in that case things start to make sense again.
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